Difference between Pre FP1 and FP1 devices

Well both devices have the S60 version 3 softwares, having used 2 mobiles one of which had Pre FP1 software and other FP1 i got some differences
FP1 devices have a lot more flexible features
FP1 devices are largely faster especially in installing softwares
Well i could not find the exact differences but I could find out which devices have FP1 and pre FP1


Pre-FP1 devices:
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Nokia N77
Nokia E61i
Nokia E65
Nokia N93i
Nokia N91 8GB
Nokia E62
Nokia E50
Nokia 5500
Nokia N93
Nokia N73
Nokia N80
Nokia N71
Nokia N92
Nokia E70
Nokia E60
Nokia E61
Nokia 3250

FP1 devices:
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Nokia 6124 classic
Nokia N82
Nokia N95-3 NAM
Nokia E51
Nokia N95 8GB
Nokia N81
Nokia N81 8GB
Nokia 6121 classic
Nokia 6120 classic
Nokia 5700 XpressMusic
Nokia 6110 Navigator
Nokia E90 Communicator
Nokia N76
Nokia 6290
Nokia N95